A lithium-niobium/tantalum-tin muscovite mine in pegmatite. Started in 1883. Owned by the Harney Peak Tin Co. This mine is famous for its huge crystals.

Originally exploited for muscovite in 1883, but acquired by the Harney Peak Tin Mining Company. Tin was never encountered in economic concentrations and the company collapsed by 1893 in "The Black Hills Tin Scandal".

Lithium (spodumene) mining commenced in 1898 and ceased in 1959. Over the years, the mine produced muscovite, niobium, tantalum, beryl and feldspar.

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References

Norton, James J. (1964) Pegmatites and other Precambrian Rocks in the Southern Black Hills; Geology and mineral deposits of some pegmatites in the southern Black Hills, South Dakota. USGS Professional Paper 297E.